<template>
  <div id="app">
    <div class="box">
      <el-row>
        <el-col :span="21"><div class="yellow"></div></el-col>
        <el-col :span="3"><div class="green"></div></el-col>
      </el-row>

      <el-row :gutter="20">
        <el-col :span="3"><div class="yellow"></div></el-col>
        <el-col :span="9"><div class="green"></div></el-col>
        <el-col :span="9"><div class="yellow"></div></el-col>
        <el-col :span="3"><div class="green"></div></el-col>
      </el-row>
    </div>
    <!-- <div class="box">
      <div class="left"></div>
      <div class="mid"></div>
      <div class="right"></div>
    </div> -->
  </div>
</template>

<script>
import HelloWorld from "./components/HelloWorld.vue";

export default {
  name: "App",
  components: {},
};
</script>
<style >
* {
  margin: 0;
  padding: 0;
}
</style>
<style lang="less" scoped>
.box {
  // width: 100vw;
  // height: 50vw;
  .yellow {
    width: 100%;
    height: 20px;
    background: yellow;
  }
  .green {
    width: 100%;
    height: 20px;
    background: greenyellow;
  }
}
</style>

